Exelon Corporation
Company typePublic
IndustryPublic utility
FoundedOctober 20, 2000; 23 years ago (2000-10-20); by merger
Key people
Calvin Butler
(president and CEO)
ServicesElectricity and natural gas distribution
RevenueIncrease US$21.73 billion (2023)
Increase US$4.023 billion (2023)
Increase US$2.328 billion (2023)
Total assetsIncrease US$101.5 billion (2023)
Total equityIncrease US$25.76 billion (2023)
Number of employees
19,962 (December 2023)
Footnotes / references

Exelon Corporation is a public utility headquartered in Chicago, and incorporated in Pennsylvania.[1] Exelon is the largest electric parent company in the United States by revenue and is the largest regulated electric utility in the United States with approximately 10 million customers. The company is ranked 99th on the Fortune 500.[2]

Exelon owns six regulated utilities: Atlantic City Electric (New Jersey), Commonwealth Edison (Illinois), PECO Energy Company (Pennsylvania), Baltimore Gas and Electric (Maryland), Delmarva Power and Light (Delaware and Maryland), and Pepco (Washington, DC and Maryland).[1]

Operating subsidiaries


Exelon Corporation was created in October 2000 by the merger between PECO Energy Company, formed in 1902, and Unicom Corporation, the parent of Commonwealth Edison, formed in 1907.[3] Unicom was based in Chicago and the city became the headquarters of the new entity. The merger was overseen by the CEO of Unicom, John Rowe, who joined the corporation in 1998 and led the newly formed Exelon until 2012, becoming the nation's longest-serving utility executive.[4][3][5]

On July 31, 2005, the Federal Energy Regulatory Commission approved the merger of Exelon and Public Service Enterprise Group, a New Jersey utility;[6] however, after 18 months, the two companies terminated the agreement due to pressure put on the New Jersey Board of Public Utilities by public interest groups, including New Jersey Citizen Action.[7][8]

On March 12, 2012, Exelon acquired Constellation Energy, with the combined company owning more than 34 gigawatts of power generation (55% nuclear, 24% natural gas, 8% renewable including hydro, 7% oil and 6% coal).[9][10]

Exelon announced the proposed purchase of Pepco Holdings on April 30, 2014, for $6.8 billion in an all-cash transaction. The merger faced stiff opposition from community groups and D.C. Mayor Muriel Bowser.[11] The merger was originally rejected by the District of Columbia Public Service Commission in August 2015, though it was approved by other federal and state regulators. The companies appealed the decision.[12] On March 23, 2016, the merger was finally approved by the District of Columbia Public Service Commission after the company made concessions and the merger was completed, making Exelon the largest regulated utility in the United States by customer count and total revenue.[13]

On February 2, 2022, Exelon completed the corporate spin-off of Constellation Energy, its energy generation business.[14] Constellation was the largest operator of nuclear power plants in the United States and the largest non-governmental operator of nuclear power plants in the world. It is also the largest competitive U.S. power generator with approximately 35,500 megawatts of owned capacity. It had full or majority ownership of 23 nuclear reactors in 14 nuclear power plants.[15][16]

Controversies and legal issues

PECO Energy: Nuclear power protests and solar energy expansion

In the 1970s, activists delayed the opening of nuclear power plants by PECO Energy.[17]

In 2015, Earth Quaker Action Team began a campaign to pressure PECO to expand the solar power it purchases, and to purchase it locally to create jobs.[18]

Pollution, security incidents

In 2005, Exelon was required to pay a $602,000 fine for exceeding the permitted sulfur dioxide emission limit from April to October 2004 at its Cromby Generating Station in Chester County, Pennsylvania.

Exelon and Illinois state officials waited for four years until 2006 before disclosing that Exelon's Braidwood Nuclear Generating Station, a nuclear plant 60 miles southwest of Chicago, had spilled millions of gallons of water containing tritium, a radioactive form of hydrogen, multiple times over a decade. Exelon officials eventually apologized and said the risks from the leak were "minimal", with tritium levels in surrounding wells all found to be below regulatory limits.[19][20]

In 2009, the Nuclear Regulatory Commission announced its plan for a $65,000 fine against Exelon for permitting its contracted security guards that were guarding its Peach Bottom Nuclear Generating Station, a two-reactor nuclear plant located in Delta, Pennsylvania, to sleep on the job. The incidents did not come to light until a videotape of the security guards was leaked to news media.[21] As a result, Exelon terminated the security contract of the Wackenhut security firm that had been involved and now operates its own in-house nuclear security force.[22]

Political activity

Exelon makes political contributions via its political action committee (PAC), EXELONPAC. In 2021 and 2022, it contributed $323,500 to federal candidates, including $202,500 to Democrats and $121,000 to Republicans.[23] In 2022, it spent $2,878,000 on lobbying.[24]


Year Revenue
in mil. USD$
Net income
in mil. USD$
Total Assets
in mil. USD$
Price per Share
in USD$
2005 15,357 923 42,797 29.47
2006 15,655 1,592 44,319 35.51
2007 18,916 2,736 45,361 46.22
2008 18,859 2,737 47,546 47.42
2009 17,318 2,707 49,180 33.05
2010 18,644 2,563 52,240 29.73
2011 19,063 2,495 54,995 31.27
2012 23,489 1,160 78,561 28.50
2013 24,888 1,719 79,924 25.47 25,829
2014 27,429 1,623 86,416 28.73 28,993
2015 29,447 2,269 95,384 28.41 29,762
2016 31,360 1,134 114,904 31.09 34,396
2017 33,531 3,770 116,700 35.78 34,621


  1. ^ a b c d e f g h i "Exelon Corporation 2023 Form 10-K Annual Report". U.S. Securities and Exchange Commission. February 21, 2024.
  2. ^ "Fortune 500: Exelon". Fortune.
  3. ^ a b Fahey, Jonathan (December 31, 2009). "Exelon's Carbon Advantage". Forbes.
  4. ^ Flaherty, Mary Pat; Mufson, Steven; Heath, Thomas (April 30, 2014). "Things could get better: Nuclear giant Exelon buys Pepco, the energy company DC loves to hate". The Washington Post. ISSN 0190-8286.
  5. ^ "Power shift at Exelon". Crain Communications. May 5, 2012.
  6. ^ "FERC clears Exelon-PSEG merger". Hart Energy. July 31, 2005.
  7. ^ Smith, Rebecca (September 15, 2006). "Exelon Abandons PSEG Acquisition, Faults New Jersey". The Wall Street Journal.
  8. ^ "No Merger For Exelon And PSEG". Forbes. September 15, 2006.
  9. ^ Haber, Gary (March 12, 2012). "Constellation, Exelon close $7.9B merger". American City Business Journals.
  10. ^ Erman, Michael (April 28, 2011). "Exelon to buy Constellation Energy for $7.9 billion". Reuters.
  11. ^ Sun, Baltimore (March 2, 2016). "Renewed opposition to Exelon-Pepco merger threatens to scuttle deal". Baltimore Sun.
  12. ^ Heath, Thomas (August 31, 2015). "Pepco, Exelon to appeal D.C. merger rejection". The Washington Post.
  13. ^ "Exelon closes deal to buy Pepco, creating largest US utility". WTTG. March 24, 2016.
  14. ^ "Exelon Completes Separation of Constellation, Moving Forward as Nation's Premier Transmission and Distribution Utility Company" (Press release). Business Wire. February 2, 2022.
  15. ^ "Exelon responds to critics by cutting Crane's pay". Crain Communications. March 16, 2017.
  16. ^ John W. Rowe (October 29, 2009). "Testimony of John W. Rowe Chairman and Chief Executive Officer Exelon Corporation Before the Committee on Environment and Public Works United States Senate". United States Senate.
  17. ^ U.S. Anti-nuclear activists partially block establishment of nuclear power plant in Limerick, PA, 1977–82, Global Nonviolent Action Database, accessed April 6, 2016.
  18. ^ Quaker group says North Philly solar panels could meet PECO power target this year. StateImpact Pennsylvania. Retrieved 2016-04-07.
  19. ^ "U.S.: Radiation leak at Byron was minimal". Chicago Tribune. February 2, 2012.
  20. ^ Hawthorne, Michael (March 12, 2010). "Exelon to pay $1 million to settle suits over leaks at power plants". Chicago Tribune.
  21. ^ Nuclear Regulatory Commission news release
  22. ^ Mufson, Steven (January 4, 2008). "Video of Sleeping Guards Shakes Nuclear Industry". The Washington Post. ISSN 0190-8286.
  23. ^ "Exelon Corp". OpenSecrets.
  24. ^ "Exelon Corp". OpenSecrets.